Another gem by Nevil Shute. The Corbetts are a normal English family—father, mother, two small children and a baby, living in a small house with a lovely garden—who find themselves scuttling to their garage for safety against a surprise bomb raid on their city. After the bomb raids continue, but only on cloudy nights, they decide to escape for safety to their small yacht, with hopes of eventually making it to safety in Canada.
The suddenness of the bomb raids pretty much destroys normal modes of communication—newspapers and radios—so no one much knows what's going on. Essential goods, gasoline, milk, bread, become scarce. Some kind of medical epidemic appears, perhaps; no one knows how virulent or wide spread. Thus everyone is left to speculate as to how best to protect themselves and their loved ones. They don't really know who the "enemy" is (never called out in the book) or why he suddenly began a random bombing campaign. People are pretty much forced to live day by day, making out as best they can. This story tells how the Corbetts themselves did that. Quite a nice story.
It was written shortly before World War II broke out, so is a bit prophetic it would seem. Certainly terrorist bombing of civilians became common in WWII, both in the German's regular air raids over London, and in our own flying over Dresden, Tokyo, Hiroshima, Nagasaki, .... Now, we're more sophisticated, we have drones do our terrorism for us. No real people involved.